Chemical Kinetics Important MCQs for NEET 2026

Chemical Kinetics – Important MCQs (NEET 2026)

The slope of Arrhenius plot (ln k v/s 1/T) of first order reaction is −5 × 10³ K. The value of Ea of the reaction is. Choose the correct option for your answer. [Given R = 8.314 J K−1 mol−1]
−83 kJ mol−1
41.5 kJ mol−1
83.0 kJ mol−1
166 kJ mol−1
For the chemical reaction N2(g) + 3H2(g) ⇌ 2NH3(g) the correct option is :
− d[N2]/dt = 2 d[NH3]/dt
− d[N2]/dt = 1/2 d[NH3]/dt
3 d[H2]/dt = 2 d[NH3]/dt
− 1/3 d[H2]/dt = − 1/2 d[NH3]/dt
If the rate constant of a reaction is 0.03 s−1, how much time does it take for 7.2 mol L−1 concentration of the reactant to get reduced to 0.9 mol L−1? (Given: log 2 = 0.301)
210 s
21.0 s
69.3 s
23.1 s
If the half-life (t1/2) for a first order reaction is 1 minute, then the time required for 99.9% completion of the reaction is closest to :
5 minutes
10 minutes
2 minutes
4 minutes
For the reaction, N2 + 3H2 → 2NH3, if d[NH3]/dt = 2 × 10−4 mol L−1 s−1, the value of − d[H2]/dt would be
4 × 10−4 mol L−1 s−1
6 × 10−4 mol L−1 s−1
1 × 10−4 mol L−1 s−1
3 × 10−4 mol L−1 s−1
The unit of rate constant for a zero order reaction is
mol L−1 s−1
L mol−1 s−1
L2 mol−2 s−1
s−1
The activation energy for a simple chemical reaction A ⇌ B is Ea in forward direction. The activation energy for reverse reaction
is negative of Ea
is always less than Ea
can be less than or more than Ea
is always double of Ea
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
rate is proportional to the surface coverage
rate is inversely proportional to the surface coverage
rate is independent of the surface coverage
rate of decomposition is very slow
For the reaction, 2A + B → 3C + D, which of the following does not express the reaction rate?
− d[A]/2dt
− d[C]/3dt
− d[B]/dt
d[D]/dt
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20°C to 35°C? (R = 8.314 J mol−1 K−1)
34.7 kJ mol−1
15.1 kJ mol−1
342 kJ mol−1
269 kJ mol−1

Updated for JEE Main 2026: This PYQ is important for JEE Mains, JEE Advanced and other competitive exams. Practice more questions from this chapter.

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